chore: fixing compose file for uffizi and postgres

Signed-off-by: blam <ben@blam.sh>

.github/uffizzi/docker-compose.uffizzi.yml

@@ -8,6 +8,8 @@ x-uffizzi:
 services:
   backstage:
     image: '${BACKSTAGE_IMAGE}'
+    depends_on:
+      - db
     environment:
       POSTGRES_HOST: localhost
       POSTGRES_USER: postgres

.github/uffizzi/uffizzi.production.app-config.yaml

@@ -13,7 +13,7 @@ backend:
   database:
     client: pg
     connection:
-      host: ${POSTGRES_HOST}
+      host: db
       user: ${POSTGRES_USER}
       password: ${POSTGRES_PASSWORD}
       port: 5432